Annual report pursuant to Section 13 and 15(d)

Changes in Unrecognized Tax Benefits (Detail)

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Changes in Unrecognized Tax Benefits (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 30, 2013
Apr. 30, 2011
Income Taxes [Line Items]    
Unrecognized tax benefits, beginning of year   $ 3,532
Settlement with tax authority   (1,473)
Additions based on tax positions related to the current year 1,454  
Additions based on tax positions related to prior years 569 72
Reductions due to lapse of statute of limitations   (2,131)
Unrecognized tax benefits, end of year $ 2,023